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d in (-oo:+oo)
3*d-2 = 5*d-4 // - 5*d-4
3*d-(5*d)-2+4 = 0
3*d-5*d-2+4 = 0
2-2*d = 0 // - 2
-2*d = -2 // : -2
d = -2/(-2)
d = 1
d = 1
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